<!-- 3D柱状图 -->
<template>
    <div id="bar" style="width:800px;height:800px"></div>
</template>

<script>
import * as echarts from 'echarts/core';
import {LegendComponent} from 'echarts/components';
import {CustomChart} from 'echarts/charts';

echarts.use([LegendComponent, CustomChart]);
let colorList = ['#33b56a', '#fdcf5c', '#4c90ff', '#fe7b7a', '#69ccf6', '#a38bf8', '#ff9561', '#8cb0ea', '#fe81b4', '#ffb258']
export default {
    name: "Bar3D",
    data() {
        return {
            data: [],
            option: {},

        }
    },
    mounted() {
        this.data = [
            {name: '京哈高速', value: 10},
            {name: '京哈高速1', value: 20},
            {name: '京哈高速2', value: 30},
            {name: '京哈高速3', value: 40},
            {name: '京哈高速4', value: 50},
            {name: '京哈高速5', value: 60},
            {name: '京哈高速6', value: 70},
            {name: '京哈高速7', value: 80},
            {name: '京哈高速8', value: 90},
            {name: '京哈高速9', value: 100},
            {name: '京哈高速10', value: 110},
            {name: '京哈高速11', value: 120}
        ];
        // 拼轴显示和数据的数组
        let xAxisText = [];
        let dataList = [];
        this.data.forEach(item => {
            xAxisText.push(item.name);
            dataList.push(item.value)
        })
        // 从这里开始 创建自定义图形 —— 长方体的正面
        let MyCubeRect = echarts.graphic.extendShape({
            shape: {
                x: 0,
                y: 0,
                width: 180,      // 长方体宽度
                zWidth: 8,      // 阴影折角宽
                zHeight: 4      // 阴影折角高
            },
            buildPath: function (ctx, shape) {
                console.log(ctx, shape);
                const api = shape.api;
                const xAxisPoint = api.coord([shape.xValue, 0]);
                const p0 = [shape.x, shape.y];
                const p1 = [shape.x - shape.width / xAxisText.length, shape.y];
                const p4 = [shape.x + shape.width / xAxisText.length, shape.y];
                const p2 = [xAxisPoint[0] - shape.width / xAxisText.length, xAxisPoint[1]];
                const p3 = [xAxisPoint[0] + shape.width / xAxisText.length, xAxisPoint[1]];

                ctx.moveTo(p0[0], p0[1]); //0
                ctx.lineTo(p1[0], p1[1]); //1
                ctx.lineTo(p2[0], p2[1]); //2
                ctx.lineTo(p3[0], p3[1]); //3
                ctx.lineTo(p4[0], p4[1]); //4
                ctx.lineTo(p0[0], p0[1]); //0
                ctx.closePath();
            }
        })
        // 创建第二个自定义图形 —— 长方体的上面和侧面
        let MyCubeShadow = echarts.graphic.extendShape({
            shape: {
                x: 0,
                y: 0,
                width: 180,
                zWidth: 8,
                zHeight: 4
            },
            buildPath: function (ctx, shape) {
                const api = shape.api;
                const xAxisPoint = api.coord([shape.xValue, 0]);
                //   const p0 = [shape.x, shape.y];
                const p1 = [shape.x - shape.width / xAxisText.length, shape.y];
                const p4 = [shape.x + shape.width / xAxisText.length, shape.y];
                const p6 = [shape.x + shape.width / xAxisText.length + shape.zWidth, shape.y - shape.zHeight];
                const p7 = [shape.x - shape.width / xAxisText.length + shape.zWidth, shape.y - shape.zHeight];
                const p3 = [xAxisPoint[0] + shape.width / xAxisText.length, xAxisPoint[1]];
                const p5 = [xAxisPoint[0] + shape.width / xAxisText.length + shape.zWidth, xAxisPoint[1] - shape.zHeight];

                ctx.moveTo(p4[0], p4[1]); //4
                ctx.lineTo(p3[0], p3[1]); //3
                ctx.lineTo(p5[0], p5[1]); //5
                ctx.lineTo(p6[0], p6[1]); //6
                ctx.lineTo(p4[0], p4[1]); //4

                ctx.moveTo(p4[0], p4[1]); //4
                ctx.lineTo(p6[0], p6[1]); //6
                ctx.lineTo(p7[0], p7[1]); //7
                ctx.lineTo(p1[0], p1[1]); //1
                ctx.lineTo(p4[0], p4[1]); //4
                ctx.closePath();
            }
        });
        echarts.graphic.registerShape('MyCubeRect', MyCubeRect);
        echarts.graphic.registerShape('MyCubeShadow', MyCubeShadow);
        this.option = {
            color: ['#33b56a', '#fdcf5c', '#4c90ff', '#fe7b7a', '#69ccf6', '#a38bf8', '#ff9561', '#8cb0ea', '#fe81b4', '#ffb258'],
            title: {
                text: '验算路线排行榜',
                left: 20,
                top: 20
            },
            legend: {
                show: true,
                top: 25
            },
            grid: {
                left: '3%',
                right: '4%',
                top: '15%',
                bottom: '3%',
                containLabel: true
            },
            xAxis: {
                type: 'category',
                data: xAxisText,
                // boundaryGap: true,
                interval: 0,
                axisLabel: {
                    color: '#333',
                    //  让x轴文字方向为竖向
                    // interval: 0,
                    // formatter: function (value) {
                    // 	return value.split('').join('\n')
                    // }
                }
            },
            yAxis: {
                type: 'value'
            },
            tooltip: {
                trigger: 'axis',
                axisPointer: {
                    type: 'shadow'
                },
            },
            series: [
                {
                    name: '次数',
                    type: 'custom',
                    renderItem: (params, api) => {
                        let location = api.coord([api.value(0), api.value(1)]);
                        return {
                            type: 'group',
                            children: [{
                                type: 'MyCubeRect',
                                shape: {
                                    api,
                                    xValue: api.value(0),
                                    yValue: api.value(1),
                                    x: location[0],
                                    y: location[1]
                                },
                                style: {
                                    fill: colorList[params.dataIndex % colorList.length]
                                },      // api.style()——继承原本的样式
                            }, {
                                type: 'MyCubeShadow',
                                shape: {
                                    api,
                                    xValue: api.value(0),
                                    yValue: api.value(1),
                                    x: location[0],
                                    y: location[1]
                                },
                                style: {
                                    fill: colorList[params.dataIndex % colorList.length],
                                    text: ''            // 继承原本样式的基础上将label清空 如果不清空生成的图上会显示两个重叠的label
                                }
                            }]
                        }
                    },
                    // stack: '总量1',
                    label: {
                        show: true,
                        position: 'top',
                        color: '#333',
                        formatter: `{c}次`,
                        fontSize: 16,
                        distance: 15
                    },
                    itemStyle: {
                        color: (params) => {
                            // 使每根柱子颜色都不一样
                            return colorList[params.dataIndex % colorList.length]
                        }
                    },
                    data: dataList
                }]
        }
        this.initEcharts();
    },
    methods: {
        initEcharts() {
            let myChart = echarts.init(document.getElementById('bar'))
            myChart.setOption(this.option)
        }
    }
}

</script>